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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | $ 26,446 | $ 36,875 | $ 27,361
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 27,683 | 26,402 | 23,784
Capital Expenditures | 26,446 | 36,875 | 27,361
PE Films | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 6,522 | 6,280 | 6,263
Capital Expenditures | 1,772 | 3,289 | 2,997
Aluminum Extrusions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 17,927 | 17,414 | 15,326
Capital Expenditures | 20,339 | 23,664 | 18,914
Subtotal | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 27,314 | 26,138 | 23,577
Capital Expenditures | 26,434 | 35,104 | 27,514
General corporate | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 369 | 264 | 207
Capital Expenditures | 12 | 1,771 | (153)
Flexible Packaging Films | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 2,865 | 2,444 | 1,988
Capital Expenditures | $ 4,323 | $ 8,151 | $ 5,603

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